Z. A. Karpovich

HPHT-Treated Impact Diamonds from the Popigai Crater (Siberian Craton): XRD and Raman Spectroscopy Evidence

А. И. Чепуров, S. V. Goryaĭnov, S. А. Gromilov, Е. И. Жимулев et autres

Phase change and graphitization of diamonds from the Popigai impact crater (Krasnoyarsk Territory, Siberian platform, Russia) exposed to high-pressure high-temperature (HPHT) conditions of 5.5 GPa and 2000–2200 °C are studied by Raman spectroscopy and X-ray diffractometry (XRD). Light-color diamonds of type 1, …

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Characterization of the nitrogen state in HPHT diamonds grown in an Fe–C melt with a low sulfur addition

Alexander Yèlisseyev, Е. И. Жимулев, Z. A. Karpovich, А. А. Чепуров et autres

This paper reports the results of high-pressure high-temperature (HPHT) diamonds growing in an Fe–C melt with introduction of 1 wt% sulfur.

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Growth Diamond on an Impact Lonsdaleite-bearing Diamond from the Popigai Astrobleme

Z. A. Karpovich, Е. И. Жимулев, А. И. Чепуров

The Popigai astrobleme contains huge reserves of diamonds with unusual properties. In impact diamonds from the Popigai astrobleme, the cubic phase and lonsdaleite are intergrown. In order to study the relationship of lonsdaleite-bearing impact diamonds with diamond, an experimental study of the …

Low-Nitrogen Diamond Growth in the Fe–C–S System

Е. И. Жимулев, Yu. V. Babich, Z. A. Karpovich, А. А. Чепуров et autres

Abstract The first results on diamond growth in the Fe–С–S system with 1 wt % S (relative to Fe) at 6 GPa and 1450°C have been reported. The diamonds obtained contain about 30 ppm N, on average, and belong to the low-N …

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Experimental Modeling of Diamond Formation Processes in Fe-C-S System at High P-T Parameters

Z. A. Karpovich, Е. И. Жимулев

The problem of diamond formation, despite the huge amount of accumulated information, has not been finally resolved. Currently, the most well-established hypothesis is that the diamond will be formed as a result of metasomatosis. According to this theory, the source of carbon …

Dissolving Macrocrists of Olivine in a Kimberlite Melt at High P–T Parameters

I. A. Gryaznov, Z. A. Karpovich, I. A. Ishutin, Е. И. Жимулев